Adsorbent and preparation method and application thereof

A technology of adsorbent and molecular sieve, which is applied in the field of chemical materials, can solve problems such as difficult to meet the selective separation requirements of methane/nitrogen adsorption, achieve high-efficiency adsorption and separation performance, easy realization, and the effect of improving selectivity

Inactive Publication Date: 2021-03-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key factor affecting the separation of methane / nitrogen by PSA is the adsorbent. The adsorbents currently used are generally difficult to meet the selective separation requirements of methane / nitrogen.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] First, 10g of FAU-type 13X molecular sieve was ion-exchanged with 400mL of 1M tetramethylammonium chloride aqueous solution for 2h in a water bath at 60°C, washed three times with deionized water, exchanged three times, and dried to obtain the adsorbent. It is 1#. Under the conditions of 25°C and 100KPa, the CH of the obtained product 4 and N 2 The adsorption capacity is 10.27cm 3 / g and 3.36cm 3 / g, the equilibrium separation ratio of methane and nitrogen is 3.06.

Embodiment 2

[0048] First, 10g of FAU-type Na-Y molecular sieves were ion-exchanged with 200mL of 1M tetraethylammonium chloride aqueous solution for 4h in a water bath at 80°C, washed three times with deionized water, exchanged three times, and dried to obtain the adsorbent. , marked as 2#. Under the conditions of 25°C and 100KPa, the CH of the obtained product 4 and N 2 The adsorption capacity is 7.21cm 3 / g and 3.01cm 3 / g, the equilibrium separation ratio of methane and nitrogen is 2.4.

Embodiment 3

[0050] First, 10 g of FAU type Na-Y molecular sieves were ion-exchanged with 400 mL of 1M tetramethylammonium chloride aqueous solution for 6 hours in a water bath at 70 °C, washed three times with deionized water, exchanged three times, and dried to obtain the adsorbent. Dry to obtain adsorbent, marked as 3#. Under the conditions of 25°C and 100KPa, the CH of the obtained product 4 and N 2 The adsorption capacity is 11.65cm 3 / g and 2.57cm 3 / g, the equilibrium separation ratio of methane and nitrogen is 4.53.

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PUM

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Abstract

The invention discloses an adsorbent as well as a preparation method and application thereof. The adsorbent comprises a modified molecular sieve, wherein the modified molecular sieve is a molecular sieve obtained by ion exchange of organic amine cations. According to the prepared adsorbent, the affinity of a molecular sieve framework to methane is improved, the selectivity of the adsorbent to methane is improved, the methane/nitrogen separation ratio reaches up to 4.53 or above, efficient methane/nitrogen adsorption separation performance is shown, effective separation of methane/nitrogen in pressure swing adsorption can be achieved, the requirement for separating methane/nitrogen through industrial pressure swing adsorption is met, and industrial operating cost is reduced.

Description

technical field [0001] The application relates to an adsorbent and its preparation method and application, belonging to the field of chemical materials. Background technique [0002] The separation of nitrogen from methane is of great significance for the widely used natural gas. Since the presence of nitrogen will reduce the calorific value of natural gas, natural gas containing a certain amount of nitrogen usually needs to increase the concentration to meet the requirements of minimum calorific value for pipeline transportation. Due to the small difference in the kinetic diameters of methane and nitrogen (CH 4 for N 2 for ), and both are non-polar molecules, methane has a high polarizability, and nitrogen has a dipole moment, making the separation of the two very difficult. The currently used methane and nitrogen separation technology is cryogenic distillation, but cryogenic distillation is very energy-intensive, and the cost of cryogenic liquefaction and recompressi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30B01D53/02C10L3/10
CPCB01D53/02B01J20/16C10L3/105
Inventor 吴雅琪袁丹华徐云鹏刘中民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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